Annual report pursuant to Section 13 and 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Narrative (Details)

v3.8.0.1
STOCK BASED AND DEFERRED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended 96 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock authorized under stock compensation plan (in shares) 5,350,000     5,350,000  
Remaining shares available for grant (in shares) 1,169,574.16     1,169,574.16  
Total shares reserved for existing or future equity award grants (in shares) 2,439,231     2,439,231  
Stock options granted (in shares)   0 0 0  
Stock options outstanding (in shares) 0 0 14,400 0 181,440
Total intrinsic value of options exercises   $ 0.2 $ 3.5    
Employees [Member] | Non-vested stock awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period for non-vested stock awards and stock options 5 years        
Senior executive officers and non-employee directors [Member] | Non-vested stock and performance-based awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period for non-vested stock awards and stock options 3 years